package hutool.str;

import cn.hutool.core.util.StrUtil;

import java.util.HashSet;
import java.util.Set;

public class StrDemo {
    public static void main(String[] args) {
        Set<Integer> ids = new HashSet<>();
        String s = StrUtil.join(",", ids);
        System.out.println("s = " + s);
        System.out.println(s != null);
        System.out.println(StrUtil.isNotBlank(s));
    }
}
